Fluid Distribution and Reservoir Characteristics of the Big Piney Mesaverde Reservoir, Wyo.
- F.V. Miles (Gulf Oil Corp.) | J.A. Pedersen (Belco Petroleum Corp.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- June 1962
- Document Type
- Journal Paper
- 608 - 612
- 1962. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.2.1 Phase Behavior and PVT Measurements, 5.1.1 Exploration, Development, Structural Geology, 5.6.1 Open hole/cased hole log analysis, 5.6.2 Core Analysis, 1.6 Drilling Operations, 1.2.3 Rock properties, 4.1.2 Separation and Treating, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 2.4.3 Sand/Solids Control, 5.6.4 Drillstem/Well Testing, 5.5.2 Core Analysis, 5.1 Reservoir Characterisation, 4.1.5 Processing Equipment, 1.6.9 Coring, Fishing, 1.10 Drilling Equipment, 5.2 Reservoir Fluid Dynamics
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The text presents an approach used to evaluate a productive reservoir whose hydrocarbon accumulation is under hydrodynamic control. The fluid, rock and structural factors that control the distribution of the fluids and their flow characteristics have been studied. Potentiometric and structural information have been utilized to determine the limits of the hydrocarbon accumulation and its qualitative relationship with structure. A comparison is made of predicted and actual gas-oil and oil-water contacts. The oil column was divided into two producing intervals, and capillary-pressure and relative-permeability data were utilized to evaluate their fluid distribution and transmissibility.
One of the main problems to be solved in evaluating a hydrocarbon reservoir is determining the fluid interfaces and their relationship with structure. This is especially vital in reservoirs where the hydrocarbon accumulation is under hydrodynamic control. The purpose of this paper is to report an approach used to determine the distribution and structural relationship of the gas, oil and water phases in the Big Piney Mesaverde reservoir, Sublette County, Wyo. In conjunction with this study, potentiometric data have been utilized to evaluate entrapment, and a study has been made of the rock and fluid properties of the reservoir which are related to saturation distributions and flow mechanics. The Big Piney Mesaverde reservoir lies approximately 100-miles northwest of Rock Springs, Wyo. The field was discovered in Aug., 1957, by the Gulf No. 1 Tresner State well located in the SW-NW Section 36-29N-113W (see Fig. 1) which produced gas and oil during drill-stem testing. Selective tests during completion in the gas and oil columns resulted in indicated capacities of 9.5 MMcf/D and 118 BOPD, respectively. The discovery was confirmed by Belco Petroleum Corp.'s completion in Jan., 1958, of Well B-34. Initial development in the field showed that the oil column possessed a low productive capacity; this subsequently was attributed to a combination of circumstances, including a low reservoir temperature, a relatively high pour-point oil and low matrix permeability. No particular difficulty was observed in producing free gas. Due to this situation, only 17 wells were completed within two years after discovery. In June, 1959, development was stimulated when Gulf Oil Corp. introduced notch-fracing, and 40 wells had penetrated the reservoir by the end of 1960. To date, production has been curtailed by market restrictions and the need of conserving gas-cap energy; however, as of Jan., 1961, the field had produced approximately 740,000 STB of oil, 1,760 MMcf of separator gas and negligible volumes of water. Fig. 1 is a plat of the producing area showing the limits of development drilling to Jan. 1, 1961, and the areal distribution of the hydrocarbons.
The Big Piney Mesaverde reservoir lies on the LaBarge Platform, a major structural feature on the west edge of the Green River basin.
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